Mold clamping and precure of a polymerizable hydrogel
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United States of America Patent
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Jun 22, 1999
Issued Date -
N/A
app pub date -
Nov 12, 1997
filing date -
Jun 10, 1994
priority date (Note) -
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Abstract
An apparatus and method for curing a polymerizable monomer or monomer mixture to form a soft contact lens includes a transport device for transporting a plurality of contact lens molds to a precure station in a low oxygen environment, each contact lens mold including a first and second mold half with a polymerizable monomer or monomer mixture therebetween. A clamping member clamps a first contact lens mold half against a second contact lens mold half for a predetermined pressure and time. While the mold halves of the contact lens mold are clamped, the polymerizable monomer or monomer mixture is exposed to a radiant energy source for partially polymerizing the polymerizable monomer or monomer mixture contained in each contact lens mold.
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